Fuel pump lobes can wear out, but it's a rare occurrence. Use an inspection mirror and a bright light to look into the fuel pump hole while someone taps the starter pedal repeatedly to see if there's a high spot left on the cam. (No, don't stick a finger in there!)
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!